Balanqed throttle-valve



(No Model.) m

W. A. PEHJR.

BALANGED THRTTLE TALVE. No. 360,171. Patented Mam. 2Q., 183W UNITED STATES f WILLIAM ALLENPENDRY, or nnrRoIT, MICHIGAN.

amanece THRo'rTLE-VALVE.

SPECIFICATION forming-part Of LettelBvPatnt Nb. 360,171. dated IvIarch 29`, 188.7.

Application filed January l1, 188e'.

m by me August 7,1883, N o. 282,766, but is shown in the drawings as applied to a straight-way valve, and with a'slight struetural'change in the method of attachment of the stem to the valve.

Figures 1 and 2 arevertical central sections through the valve at right angles to each other.

A represents a shell having aseat, B, formed at its upper end, either by being turned on the shell, as in Fig. 2, or by being'lnade in brass 2o and bolted to the upper end eithe'shell, asin M represents a pot yin the shape of a cylinder openat the upper end and closed at the lower end, suspended within the shell .A below 2 5 the valve-seat,either by arms J eitending down from the valve-seat, as in Fig. 1, in which case the valveseat and pot are east together and bored at one ope-ration, or by wings J, projecting from the inner wall of shell A, as in Fig.

3o 2, in which ease the pot may becast in the shell. .The arms or Wings J in either c ase perform no function but to support the p ot M, and the manner of their construction isimmaterial.

C represents the valve, adapted to 'close seat B, and extending through the seat, as in my former patent, to the pot M, and there enlarged, C', t'o iit said pot, but not necessarily to fit closely.

I represents a steam-passage Vextending en- 40 tirely through valve U, and having a valveseat formed at its upper end.

L L represent wings or fair-leaders formed I ori the valve C, extending through the seat B, simply to guide the valve, and theiry construc- '45 tion may be in anylrnown manner.

H represents the valve-stem, the lower end of which is made in the form ofavalve, adapted to close the valvcseat in the upper end of passage I, and connected by a pin, U, with alift- 5o ing-lever, W', pivoted at 'I l to a support, S,

fastened tothe shell A and to a connecting- Renewcd December 2, 18H6. Serial No. 220,550. (No model.) x

rod, X. `On the upper face of the valve C is formed a short cylinder, It, connected with the valve by one or more wings,.Q, .and rising far enough to receive the pin U through slots V, formed therein. iuder R, and when leverV is liftedit first raises stein H and then raises the valve C, pin U working in the slots V. The lever IV, as shown in the drawings, is bifurcated to pass around stein H.

The arrangement shown in the drawings is intended for a locomotive throttle-valve, and the arrangementof lifting-levers shownis suitable for such a valve, as itmnst lie within the steam-dome and be operated' from without the boiler, and it will be readily understood that when my invention is to be used in any other placeas, forinstanee, iii an ordinary straight` way valve or in a globe or anglel valve, in which' the she-Ilextends above as well as below the seat-any of the usual methods oi lift-k ing the stem and valve-as, for instance, a screw passing through a stuffing-box' lin the shell-may be substituted for and will be a simple mechanical equivalent for the liftinglevers shown, the only function'of said lever being to first raise thestem H and subsequentlyv to raise` the valve C, there being inany known devices for accomplishing this function.

. The shell A is shown as enlarged around the pot M, to give a free steainpassage there` through, and is provided at itslower endwith a flange, by which it may be bolted to asteampipe.

N N represent bolts, by which seat B is secured to the shell A when made separate from said shell. K

The operation of my invention is as follows: The valve being closed, as shown, and under steampressure, considerable force is necessary to open it. When lever W is raised, it lifts stern H and opens passage I, and as the area of this passage is'v comparatively small a small amount ot' force'will raise stem H. Steam rushes thro xgh passage I and lls pot M,where it is cbnfinefl and. presses outhe lower end of valve C, thus balancing the valve, and it is evident that by changing the relative areas of the ends of valve C the balancing eiect of the steam may be varied at will. As the-leverW continues to rise the pin U cornes in contact The stein H lies within cyl- IOO end of valve C and no balancing-pressure onthe lower end thereof, so that the valve 1;e mains firmly closed. Steam passes intothe Apassage-I when stem H is raised through the "x 5 'openings between wings Q.

It is evident that nie foi-mtr cylinder n and its connectionrwith the lifting mechanism .mayI

begreatly varied without departing from my invention,I the form being immaterial so long zo. as the cylinder constitutes an attachment be# tween the valve C and the lifting mechanism., by which the lifting mechanism -Will iirst'raisc the stem-H and then raise valve C) What I claim as my invention, and desire to 25 v secure by Letters Patent, is'

1. The combinatiomwith the shell otf av valve,

of a seat formed inor on said shell, ai pot suspended below ,said seat, a valve adapted to close 4said, seat and extending through said seat intov said pot, and having a passage there-` 3o through, a .valvestem adapted to close :saidI passage through said valve, liftingmechanism conneeted with said stem, and a lost-motion I y connection between said valve and the lifting inechanism,.whereby the action of the lifting 35 mechanism-will iirst raise said valvestem and then raise the val've, substantially as shown' and described.

2. Iny combination with the valve C, having the passage I therethrough, the stem H, lift- 4o ing mechanism connected with said stem, and `i a lost-motion connection between' the upper end f valveCand the lifting mechanism, sub-f` stantiallyl as shownand described. ,Y

`3. The combination, vwitha valvefshell and 5,5 seat, of a pot suspended ybelow ,said seat by a skeleton'support, and valve C, withy its enlargement C', substantially as shown and described.

' WM. lALLEN PENDRY.

Witnesses: ,i v

SUMNER COLLINS, GEO. H. Lo'rHRor. 

